rebased willclose: Optimize performance of table writers and refactor table model

[hellais]

superseeded by new PR

[codecov]

Codecov Report

Attention: Patch coverage is 94.90085% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 83.54%. Comparing base (0ce4177) to head (d02e6b5).
Report is 1 commits behind head on pipeline-prod-debug.

Files	Patch %	Lines
oonidata/src/oonidata/models/base.py	76.19%	5 Missing ⚠️
oonipipeline/src/oonipipeline/db/create_tables.py	93.44%	4 Missing ⚠️
oonipipeline/src/oonipipeline/cli/commands.py	85.71%	2 Missing ⚠️
...onipipeline/analysis/website_experiment_results.py	66.66%	1 Missing ⚠️
oonipipeline/src/oonipipeline/db/connections.py	98.38%	1 Missing ⚠️
...c/oonipipeline/temporal/activities/observations.py	85.71%	1 Missing ⚠️
...oonipipeline/transforms/measurement_transformer.py	92.85%	1 Missing ⚠️
...nipipeline/transforms/nettests/web_connectivity.py	90.90%	1 Missing ⚠️
...peline/src/oonipipeline/transforms/observations.py	85.71%	1 Missing ⚠️
oonipipeline/tests/test_db.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           pipeline-prod-debug      #72      +/-   ##
=======================================================
+ Coverage                77.44%   83.54%   +6.10%     
=======================================================
  Files                       32       74      +42     
  Lines                     1893     6060    +4167     
=======================================================
+ Hits                      1466     5063    +3597     
- Misses                     427      997     +570     

Flag	Coverage Δ
oonidata	77.35% <88.88%> (-0.09%)	⬇️
oonipipeline	86.39% <95.77%> (?)

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